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Cathode ray tube having an electron gun

a technology of electron gun and cathode ray tube, which is applied in the direction of cathode ray tube/electron beam tube, electric discharge tube, instruments, etc., can solve the problems of deformation of the spot on the screen and too large dissymetry

Inactive Publication Date: 2005-03-10
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the deviating system is acted on and the direction of the beam is deflected, the spot on the screen is deformed and the problem is all the more crucial as the beam is deflected towards the periphery of the screen or even towards the corners of the screen.
On the other hand this dissymetry becomes too great when working on “high-definition” guns.

Method used

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  • Cathode ray tube having an electron gun
  • Cathode ray tube having an electron gun
  • Cathode ray tube having an electron gun

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Embodiment Construction

According to one embodiment of the invention for the cathode ray tube, the centre of the left aperture of the first electrode is situated on the third axis and the centre of the left aperture of the third electrode is situated on a fifth axis parallel to the axis of the gun and distinct or otherwise from the first axis. The centre of the right aperture of the first electrode is then situated on the fourth axis and the centre of the right aperture of the third electrode is situated on a sixth axis parallel to the axis of the gun and distinct or otherwise from the second axis.

Preferably, the first, the second and the third electrode are of plane form.

According to one embodiment of the invention, the first, third and fifth axes are symmetric respectively with the second, fourth and sixth axes with respect to the axis of the gun.

Moreover, the first and second axes may be symmetric respectively with the third and fourth axes with respect to the axis of the gun.

Moreover, the aper...

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PUM

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Abstract

The invention relates to a cathode ray tube having an electron gun oriented along an axis (Z), comprising a quadrupolar device which comprises three electrodes (5, 6, 7). Each electrode possesses a central aperture, a right lateral aperture and a left lateral aperture all three substantially rectangular. The centres (c5.1, c7.1) of the central apertures of the three electrodes are aligned along the axis (Z) of the gun. The centres (c6.1, c6.3) of the left and right lateral apertures of the second electrode (6) are situated along respectively a first axis (z1) and a second axis (z3) that are parallel to the axis (Z) of the gun. The centres (c5.1, c7.1) of the left and right lateral apertures (5.1, 5.3, 7.1, 7.3) of the first and / or of the third electrode (5,7) are offset with respect to the axes (z1, z3) passing through the centres of the apertures of the second electrode. Such an arrangement makes it possible to correct the MODEC defects.

Description

FIELD OF THE INVENTION The invention relates to a cathode ray tube having an electron gun suitable for high definition. BACKGROUND OF THE INVENTION A conventional television tube comprises an almost plane faceplate or screen of rectangular shape. The screen is furnished on its internal face with a mosaic of patches of phosphors or pixels which excited by an electron beam emit light which may be blue, green or red, depending on the phosphor excited. An electron gun sealed in the envelope of the tube is directed towards the centre of the screen and makes it possible to emit the electron beam towards the various points of the screen through a perforated mask (or shadow mask). The electron gun makes it possible to focus the electron beam onto the internal face of the screen carrying the phosphors. A deviating system placed around or on either side of the tube makes it possible to act on the direction of the electron beam so as to deviate its trajectory. Continual action of the devia...

Claims

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Application Information

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IPC IPC(8): H01J29/48H01J29/50
CPCH01J29/503H01J29/48
Inventor GUEUGNON, NICOLASBIZOT, PIERREGISSOT, GREGOIRERICHARD, NICOLAS
Owner THOMSON LICENSING SA